diff --git a/core/inject.js b/core/inject.js
index 7a89b8cb9..b4a1e3539 100644
--- a/core/inject.js
+++ b/core/inject.js
@@ -441,9 +441,14 @@ Blockly.inject.bindDocumentEvents_ = function() {
       Blockly.hideChaff();
       Blockly.Touch.clearTouchIdentifier();  // Don't block future drags.
     });
-    Blockly.bindEventWithChecks_(document, 'scroll', null,
-        Blockly.mainWorkspace.updateInverseScreenCTM
-            .bind(Blockly.mainWorkspace));
+    Blockly.bindEventWithChecks_(document, 'scroll', null, function() {
+      for (var workspaceId in Blockly.Workspace.WorkspaceDB_) {
+        var workspace = Blockly.Workspace.WorkspaceDB_[workspaceId];
+        if (workspace.updateInverseScreenCTM) {
+          workspace.updateInverseScreenCTM();
+        }
+      }
+    });
     Blockly.bindEventWithChecks_(document, 'keydown', null, Blockly.onKeyDown_);
     // longStop needs to run to stop the context menu from showing up.  It
     // should run regardless of what other touch event handlers have run.